Demand is the amount of water resources associated with any feature. Links and stops can have
resource demands. If resource demand is specified, it is accumulated along the path in the routing analysis,
and it can be a limiting factor in the allocation process. As links are allocated to a center, the resource
demand of each allocated link is accumulated until the center's resource capacity is reached. If the demand
of an arc would exceed this capacity, the link will not be allocated to the center.